AllThingsD is reporting that Google's long awaited Cloud Music Service will be unveiled tomorrow at Google I/O. That's not too surprising. What's a teensy bit surprising is that it's expected to be pretty much what Amazon Cloud drive already is.

Reports had previously pegged Google with loftier intentions for their music service (think streaming music like Rdio or Spotify) but it looks like Google will have to settle and just act as a 'music locker' where users users can upload their songs to the cloud and stream them down to their devices. Which is what Amazon Cloud Drive already does. The problem for Google is that they don't sell music to users. Amazon does. However! One advantage that Google is expected to have over Amazon is that they'll launch with 20GB of free storage (as opposed to Amazon's 5GB).